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hw/intc/i8259: Document i8259_init()

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i8259_init() helper creates a i8259 device on an ISA bus,
connects its IRQ output to the parent's input IRQ, and
returns an array of 16 ISA input IRQs.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230210163744.32182-2-philmd@linaro.org>
This commit is contained in:
Philippe Mathieu-Daudé 2023-02-09 13:19:46 +01:00
parent 9d724e0ba8
commit 78827d5f7b
2 changed files with 11 additions and 3 deletions
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4
hw/intc/i8259.c
View File

@ -406,7 +406,7 @@ static void pic_realize(DeviceState *dev, Error **errp)
pc->parent_realize(dev, errp);
}
qemu_irq *i8259_init(ISABus *bus, qemu_irq parent_irq)
qemu_irq *i8259_init(ISABus *bus, qemu_irq parent_irq_in)
{
qemu_irq *irq_set;
DeviceState *dev;
@ -418,7 +418,7 @@ qemu_irq *i8259_init(ISABus *bus, qemu_irq parent_irq)
isadev = i8259_init_chip(TYPE_I8259, bus, true);
dev = DEVICE(isadev);
qdev_connect_gpio_out(dev, 0, parent_irq);
qdev_connect_gpio_out(dev, 0, parent_irq_in);
for (i = 0 ; i < 8; i++) {
irq_set[i] = qdev_get_gpio_in(dev, i);
}

10
include/hw/intc/i8259.h
View File

@ -4,7 +4,15 @@
/* i8259.c */
extern PICCommonState *isa_pic;
qemu_irq *i8259_init(ISABus *bus, qemu_irq parent_irq);
/*
* i8259_init()
*
* Create a i8259 device on an ISA @bus,
* connect its output to @parent_irq_in,
* return an (allocated) array of 16 input IRQs.
*/
qemu_irq *i8259_init(ISABus *bus, qemu_irq parent_irq_in);
qemu_irq *kvm_i8259_init(ISABus *bus);
int pic_get_output(PICCommonState *s);
int pic_read_irq(PICCommonState *s);